CHEMISTRY, SOCIAL SCIENCES Correction for “Twin-chain polymer hydrogels based on poly(vinyl alcohol) as new advanced tool for the cleaning of modern and contemporary art,” by Rosangela Mastrangelo, David Chelazzi, Giovanna Poggi, Emiliano Fratini, Luciano Pensabene Buemi, Maria Laura Petruzzellis, and Piero Baglioni, which was first published March 9, 2020; 10.1073/pnas.1911811117 (Proc. Natl. Acad. Sci. U.S.A. 117, 7011–7020).
The authors note that the author contributions footnote appeared incorrectly. Emiliano Fratini should be credited with performing the research. Luciano Pensabene Buemi and Maria Laura Petruzzellis should not be credited with performing the research; Maria Laura Petruzzellis should be credited with preparing the mock-ups and performing the applicative tests on Pollock’s artworks, and Luciano Pensabene Buemi should be credited with performing the applicative tests on Pollock’s artworks and performing the cleaning treatments. All authors should be credited with writing the paper. The corrected author contributions footnote appears below.
Author contributions: P.B. designed research; R.M, D.C., E.F., and P.B. performed research; R.M., D.C., G.P., and E.F. analyzed data; M.L.P. prepared the mock-ups; L.P.B. and M.L.P. performed the applicative tests on Pollock’s artworks; L.P.B. performed the cleaning treatments; and R.M., D.C., G.P., E.F., L.P.B., M.L.P., and P.B. wrote the paper.